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Q.

The layer of soil which is rich in fauna is ____


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Detailed Solution

The layer of soil which is rich in fauna is top soil.
Soil is one of the most important parts of the earth’s crust, which is formed by the weathering and disintegration of rock particles by the action of air, water, and wind. There are four layers of soil, and they are Topsoil, Subsoil, C-Horizon, and Bedrock. The topsoil is rich in fauna. This layer of the soil is suitable for flora and fauna to grow because this layer is rich in added minerals and necessary vitamins, which are required for the suitable and proper growth of the plants. Also, earthworms are present in this layer which helps in nitrogen fixation.
 
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